All the Perl that's Practical to Extract and Report

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At least you were on the right track. Another 42 minutes or so, and you'd have ended up with my final version.

The key was not running mirror needlessly. I ended up with a multi-stage algorithm, described in the accompanying text. The result is that I don't try to mirror any CHECKSUMS for which I already have a local version and none of its associated files have been updated

It could be smaller, but it can't be silence. Besides not adequately testing things, I don't have permission to use silence. John Cage's lawyers recently settled a case over a one-minute track of silence.